Advice on ceiling


Can anyone advise on what may be causing this on my ceiling?

It is a garage and above is a bedroom. (Coach houseB)

Thanks in advance

This is a better photo

Looks like the paint is blistering. Could be caused by moisture in the material or inadequate priming before painting.

Thank you!

So my ceiling isn’t going to collapse then haha? :joy:

It’s caused by paranoia.

Looks like poor quality taping and muding.
Cosmetic only.
No worries